Phillipsburg herald. [volume] (Phillipsburg, Kan.) 1882-1905, 1887-11-18
AEECHANTCAL.

-~ $500
Mr.. BRorHERrox, Of the American
smeiter. at Leadviile, Col, generates
steam for motive power through the
use of Stag. The Stag is dumped into
large, shallow vessel1, which are after
ward run under boilers, and the heat
used in getting up steam. An expert
mental test resulted In maintaining
seventy-hve pounds pressure on a YER
deal boiler for seven days The plan
viii result in a saving to the smelter Of
81, 500 a month.
SOME months ago the floors Of many
Austrian garrisons were painted with
tar, and the results have proved so uni
formly advantageous that the method
is becoming greatly extended in its ap-
plication. The collection of dust in
cracks is thus prevented, and a conse-
quent diminution in irritative diseases
of the eye has been noted. Cleaning
Of the rooms has been greatly facili-
tated, and parasites are almost COM
pletely excluded. The coating of tar
is inexpensive, requires renewal but
once a year, and presents but one dis
advantage, namely, its sombre color.
THE new method of tanning leather
by means Of pyrofuxin, a substance OBJ
tanned from bituminous coal, is q nov
city which has attracted considerable
notice. Under the microscope the
structure of pyrofuxin-tanned leather
is seen to differ essentially from alum
or bark tanned leather; the felt
structure of the corium is finer in fibre,
more closely interviewer, but with a
sharper definition of the fibres; and the
ePidermis is also harder. though more
elastic. From this popularity OF
structure in the leather tanned by this
substance, there is consequently pro-
duced a superior article to that made
by other means, while at the same time
the epidermis is harder than in alum
and bark tanned leather. without, how
ever, being brittle. Furthermore, raw
material of comparatively low value,
rs sheepskip, for example, is changed
by pyrofuxin tanning into a product
much better and more valuable than by
the processes with alum or bark In
the use, thus far, as sheepsIin treated
according to this process, 1t has been
found to stand the test successfully
both in making and wearing. Again,
the absolute hrmness OF leather, or, IN
other words, the maximum stability OF
the fibres, after the application Of GER
tain vvafobks IS q rr5Tr--. y,e Sc ,,--,TsE-
we'll understood. Judged according tC
this standard experiments would APP
pear to show that. as compared with
leather treated by other methods, that
produced by the pyrofuxin is a decided
success.
ATTENTION has been called by the
London Engineer to some of the prev
alent theories relating to locomotive
construction, stating that, contrary to
the generally received opinion, in the
case of two Locomotives, each with
wheels the same distance apart, later.
ally, but the one with a low center oil
gravity and the other with a littl,
higher gravity center, the latter viii be
least liable to be overturned when on
the rails. For many years the con.
trary opinion was held by most engin.
GERS, and by some is so held still Ac
cording to this theory, the gauge o.
the rails represents the basis OF a tri
angle, and the center OF gravity of the
| engine represents its apex. Now if s
side strain be caused to act on the apex
If a triangle it can be resolved into twC
other forces on the triangle, If It be re
/ garded for a moment as truss or as
! solid body--one OF these force.
viii create a rotating strain, resembling
in effect the action on crank; that is
! assuming the lower corner of the tri
angle farthest from the pushing strain
to be the shaft, and the apex or pOin
/ where the strain pin Is applied as tn,
crank pin; the lower corner of the tri
angles is the turning point of the strain
the purely rotary force being equal t.
the amount Of the applied strain multi
piled by the sine Of the angle at tn.
turning point. But there Is a latera
strain also, tending to simply push tn
1 triangular body sideways, the magni
tude of this stress being equal to tina
of the applied force multiplied by tn
sine of half the top angle of the tn
angle or half its base. From this It
obvious that the greater the lowe
angle and its natural sine, rs compare,
with half the apex angle and it
natural sine, the greater viii be tn
overseeing or rotating force, and tn
less will be the amount Of lateral strain
on the rails.
Interesting Facts Concerning the Manu-